Microstructures in rapidly solidified niobium aluminidesThe microstructures of niobium aluminides produced by chill block melt spinning were compared to those of niobium aluminides produced by conventional casting. The rapidly solidified alloys were rapidly solidified by melt spinning in an argon atmosphere, and the melt-spun ribbons were examined by optical, X-ray, and TEM techniques. Microstructures were found to range from single-phase for Nb-75 at. pct Al (NbAl3) to two phase for Nb-46 at. pct Al (NbAl3 + Nb2Al). It was found that the melt spinning of Nb-aluminides produced finer grained microstructures than those produced in induction-melted ingots or in powders produced by the rotating electrode process. Ternary additions such as Cr, Ti, and Si tended to form intermetallic phases along the grain boundaries.
Document ID
19890030822
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Hebsur, Mohan G. (Sverdrup Technology, Inc. Middleburg Heights, OH, United States)
Locci, Ivan E. (NASA Lewis Research Center Cleveland, OH, United States)
Date Acquired
August 14, 2013
Publication Date
January 1, 1988
Subject Category
Metallic Materials
Meeting Information
Meeting: International Conference on Rapidly Solidified Materials